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75,8 + 249,19 = 324,99
60 – 12,45 = 47,55
16,25 x 6,7 = 108,875
75,32 : 2 = 37,66
![](https://rs.olm.vn/images/avt/0.png?1311)
75,8-7,58x3-5x7,58-7,58
=75,8-(7,58x3+5x7,58+7,58)
=75,8-7,58x(3+5+1)
=7,58x10-7,58x9
=7,58x(10-9)
=7,58x1
=7,58
tk nha!
75,8-7,58x3-5x7,58-7,58
=75,8-(7,58x3+5x7,58+7,58)
=75,8-7,58x(3+5+1)
=7,58x10-7,58x9
=7,58x(10-9)
=7,58x1
=7,58
![](https://rs.olm.vn/images/avt/0.png?1311)
20,19*45+20,19+54*20,19
=20,19*45+20,19*1+54*20,19
=20,19*(45+1+54)
=20,19*100
=2019
75,8-7,58*3-5*7,58-7,58
=7,58*10-7,58*3-5*7,58-7,58*1
=7,58*(10-3-5-1)
=7,58*1
=7.58
\(20,19\times45+20,19+54\times20,19\)
\(=20,19\times45+20,19\times1+54\times20,19\)
\(=20,19\left(45+1+54\right)\)
\(=20,19\times100\)
\(=2019\)
\(75,8-7,58\times3-7,58\times5-7,58\)
\(=75,8\times10-7,58\times3-7,58\times5-7,58\times1\)
\(=75,8\left(10-3-5-1\right)\)
\(=75,8\times1\)
\(=75,8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
+ ) 75 , 8 − 13 , 46 − 26 , 54 = 62 , 34 − 26 , 54 = 35 , 8 + ) 75 , 8 − ( 13 , 46 + 26 , 54 ) = 75 , 8 − 40 = 35 , 8
Mà 35 , 8 = 35 , 8
Vậy 75 , 8 − 13 , 46 − 26 , 54 = 75 , 8 − ( 13 , 46 + 26 , 54 )
Đáp án A
![](https://rs.olm.vn/images/avt/0.png?1311)
75 ,8 x ( 4+5+1)
=75 ,8 x10
=7580
296,03x ( 84,5 + 40,5 -25)
=296,03 x 100
=29603
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 42,5+29,4x7,5:0,1
=42,5+220,5:0,1
=42,5+2005
=2247,5
b.921,4+75,8x0,1-84:0,1
=921,4+7,58-840
=928,98-840
=88,98
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 75,8 x 4 + 75,8 x 5 + 75,8
= 75,8 x (4 + 5 + 1)
= 75,8 x 10
= 758
b) 296,03 x 84,5 + 296,03 x 40,5 - 25 x 296,03
= 296,03 x (84,5 + 40,5 - 25)
= 296,03 x 100
= 29603
75,8 + 249,19 = 324,99